Lactase is an enzyme found in the digestive tract that digests lactose a common carbohydate found in milk. would the genes for lactase be turned on or off after eating cheese and why?

Urgent in guinea pigs, black fur (b) is dominant over white fur (b). cross a heterozygous (hybrid) black guinea pig with a homozygous (purebred) white guinea pig. complete a punnett square, identify the genotype(s), phenotype(s), and probability (% and fraction) that the offspring will be black and white?